EP1273790A2 - Injecteur de combustible pour moteurs à combustion interne - Google Patents

Injecteur de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP1273790A2
EP1273790A2 EP02006852A EP02006852A EP1273790A2 EP 1273790 A2 EP1273790 A2 EP 1273790A2 EP 02006852 A EP02006852 A EP 02006852A EP 02006852 A EP02006852 A EP 02006852A EP 1273790 A2 EP1273790 A2 EP 1273790A2
Authority
EP
European Patent Office
Prior art keywords
valve
pressure piece
bore
piston
valve needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02006852A
Other languages
German (de)
English (en)
Other versions
EP1273790A3 (fr
Inventor
Tibor Bauer
Claudio Arrabito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1273790A2 publication Critical patent/EP1273790A2/fr
Publication of EP1273790A3 publication Critical patent/EP1273790A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engines from, as is the genus of the claim 1 corresponds.
  • a fuel injector is for example from the published patent application DE 198 27 267 A1 known.
  • a piston-shaped valve needle longitudinally displaceable in the housing of the fuel injector. Through the longitudinal movement the valve needle becomes the opening of at least one Injection opening controlled, that at the combustion chamber end of the fuel injection valve is arranged.
  • the fuel injector also has a valve piston on, which is coaxial to the valve needle in the housing of the fuel injector is arranged and also longitudinally displaceable is trained.
  • a pressure piece for the valve piston and the valve needle which is cylindrical on its outer surface is.
  • the pressure piece is in a hole in the housing guided.
  • the stroke of the valve needle is set.
  • fuel injection valve has the disadvantage on that it is due to transverse forces on the pressure piece, the assembly or can be production-related, in its longitudinal movement to wear, friction and a reduction in injected Amount of fuel can come.
  • the known fuel injector has the disadvantage on that over the pressure piece transverse forces on the valve needle can be exercised, leading to increased wear and tear lead the valve needle and eventually the failure of the Can lead fuel injector.
  • the fuel injector according to the invention with the characteristic Features of claim 1, however, points the advantage that the influence of the transverse forces on the Valve needle is minimized so that the life of the Fuel injector is extended.
  • the pressure piece is here cylindrical on the outer surface and is guided in a guide sleeve arranged in the housing. Through the guide sleeve and the associated better Coaxiality between the pressure piece and the valve needle is the influence of the lateral forces on the valve needle is minimized.
  • the pressure piece has an open to the valve piston Blind hole on.
  • the valve piston rests against the bottom, which has the advantage that the valve piston on its the valve needle facing end in the blind hole of the pressure piece is guided and exactly centered with respect to the pressure piece remains.
  • the Pressure piece at least one in the longitudinal direction of the pressure piece running off-center leak oil hole on that of the valve needle facing end face connects with the blind hole.
  • the end face of the pressure piece facing the valve needle in recesses formed in the radial direction, the the at least one drain hole with the outer surface of the pressure piece connects. This will be more advantageous Way the flow of the leak oil further optimized.
  • the housing comprises a valve body and a valve holding body resting thereon, the valve needle in the valve body and the Valve piston is arranged in the valve holding body.
  • both bodies can be made independently, so that in particular the recesses that the valve needle and take up the valve piston, can be processed better.
  • the piston bore stepped and points to the contact surface of the valve body and the valve holding body the same Diameter on like the bore receiving the valve needle in the valve body.
  • the guide sleeve is located with part of its length on the wall of the piston bore on and with another part of its length on the Wall of the bore formed on the valve body, which the valve needle receives.
  • FIG 1 is a longitudinal section through an inventive Fuel injector shown.
  • the fuel injector has a housing 1 which has a valve holding body 3 and a valve body 5 comprises.
  • the valve holding body 3 and the valve body 5 lie on a contact surface 8 to each other and are axially by a clamping nut 6 Braced towards each other.
  • a bore 7 is formed in which a piston-shaped valve needle 10 is arranged to be longitudinally displaceable.
  • the valve needle 10 is in a section facing away from the combustion chamber in the Bore 7 is sealingly guided and tapers the combustion chamber to form a pressure shoulder 15.
  • valve sealing surface 14 On the combustion chamber side At the end the valve needle 10 goes into a valve sealing surface 14 over, which is substantially conical and with one formed at the combustion chamber end of the bore 7, also conical valve seat 12 cooperates. At least one injection opening 16 is in the valve seat 12 formed the bore 7 with the combustion chamber of the internal combustion engine combines. By creating the valve sealing surface 14 on the valve seat 12, the injection openings 16 are against the hole 7 is closed and when lifting the valve sealing surface 14 opened by the valve seat 12 accordingly. By a radial expansion of the bore 7 is at the level of the pressure shoulder 15 a pressure chamber 9 is formed, the valve seat 12 as an annular channel surrounding the valve needle 10 continues.
  • the pressure chamber 9 is in the valve body 5 and in the valve holder body 3 formed inlet channel 18 with a high-pressure connection formed on the valve holding body 3 20 connected.
  • the high pressure connection 20 is with a high-pressure fuel source, not shown in the drawing connectable, the fuel under high pressure promotes via the inlet channel 18 in the pressure chamber 9. There becomes a predetermined when the fuel injector is operating Maintain fuel pressure level.
  • valve holding body 3 is coaxial with the bore 7 of the valve body 5 a piston bore 26 is formed, which as a Diameter stepped blind bore is executed and in which a piston-shaped valve piston 30 is longitudinally displaceable is arranged.
  • the valve piston 30 is against one arranged in the piston bore 26 pressure piece 32, which in turn abuts the valve needle 10. Move through it the valve needle 10, the pressure piece 32 and the valve piston 30 synchronously with the opening stroke movement of the valve needle 10.
  • a control chamber 50 which has an inlet throttle 52 is connected to the inlet channel 18 and via an outlet throttle 54 with a formed in the valve holding body 3 Leakage oil chamber 56.
  • the leakage oil chamber 56 is here with a connected leakage oil system, not shown in the drawing, so that the leakage oil chamber 56 always has a low fuel pressure having.
  • a magnet armature 58 is arranged in the leakage oil chamber 56, on which a sealing ball 64 is arranged by which the outlet throttle 54 is closable.
  • the magnetic anchor 58 is longitudinally displaceable and against a closing spring 62 can, moved by the force of one arranged in the leak oil space 56 Electromagnet 60, against the closing force of the spring 62 are moved in the longitudinal direction. This can be electrical controlled the flow restrictor 54 opened or closed become.
  • FIG. 2 shows an enlargement of FIG. 1 in the area of the Pressure piece 32 shown.
  • Valve holding body 3 is by a radial expansion Piston bore 26 a spring chamber 22 is formed.
  • a closing spring 24 is arranged, which is used as a helical compression spring is formed and which is stationary at one end and at the other end via a washer shaped washer 34 supports on the pressure piece 32 so that it is constantly a force acting in the closing direction on the valve needle 10 results.
  • the pressure piece 32 is on its outer surface cylindrical and has one on the Valve needle 10 facing away from the open blind bore 39 on the base of which the valve piston 30 is supported.
  • the end face of the valve piston resting on the pressure piece 32 30 is spherical, so that there are none or result in only slight transverse forces on the pressure piece 32.
  • the valve piston 30 is at least in part its protruding length in the pressure piece 32 in the Blind bore 39 out, so that there is a precisely coaxial alignment of the valve piston 30 with respect to the pressure piece 32 results.
  • In the pressure piece 32 there are two leakage oil holes off-center 37 formed by the valve needle 10 facing Front end of the pressure piece 32 and laterally in the blind bore 39 open.
  • Figure 3 shows a cross section by Figure 2 along the line III-III.
  • the leak oil holes 37 lie with respect to the longitudinal axis of the pressure piece 32 diametrically opposite.
  • Fig. 4 shows a cross-section along the line IV-IV of Fig. 2, in the the shape of the recess 41 is visible. Because in the middle of the Front of the pressure piece 32 remains material, are the Ends of the leak oil holes 37 facing the valve needle 10 always spaced from the valve needle 10. About the recess 41 and the drain holes 37 can fuel that between the valve needle 10 and the wall of the bore 7 the pressure chamber 9 emerges into the piston bore 26 and there via a leak oil system not shown in the drawing get into the leak oil chamber 56. That way stays the spring chamber 22 is always approximately pressureless.
  • a receiving bore 27 at the end of the piston bore 26 which has exactly the same diameter as one formed at the end of the valve body 5 facing away from the combustion chamber Extension 28 of hole 7.
  • a guide sleeve 36 is arranged, the form-fitting on its outer surface in the Receiving bore 27 abuts and in which the pressure piece 32 is guided is.
  • the guided section of the valve needle 10 has a slightly smaller diameter than the inner diameter the guide sleeve 36 so that there is no guidance the valve needle 10 results through the guide sleeve 36.
  • the Pressure piece 32 is on the valve needle 10 facing End face also spherical, so that also this interface no lateral forces from the pressure piece 32 the valve needle 10 result.
  • the guide sleeve 36 is ensured that the receiving bore 27 and the extension 28 of the bore 7 arranged exactly coaxially with each other are so that the pressure piece 32 exactly in the middle of the valve needle 10 presses and an optimal central introduction of closing force exerted by the valve piston 30 on the Pressure piece 32 or the valve needle 10 takes place.
  • the guide sleeve 36 is preferably made of a hard steel, to the wear and thus the friction between the guide sleeve 36 and the pressure piece 32 as low as to keep possible.
  • the fuel injector works like follows: Should no fuel in the combustion chamber of the internal combustion engine are injected, the electromagnet 60 is not energized so that by the closing spring 62 of the armature 58 closes the outlet throttle 54 by means of the sealing ball 64. As a result, the same prevails in the pressure chamber 50 Pressure as in the inlet channel 18, so that there is a hydraulic Force on the face of the valve piston facing away from the combustion chamber 30 results, the pressure piece 32 on the valve needle 10 acts.
  • inlet throttle 52 and outlet throttle 54 decreases Pressure in the pressure chamber 50, so that the hydraulic Force on the end face of the valve piston 30 reduced so that the hydraulic force on the pressure shoulder 15 of the valve needle 10 predominates and the valve needle 10 together with the pressure piece 32 and the valve piston 30 is moved away from the valve seat 12.
  • the fuel flows out the pressure chamber 9 through the injection openings 16 in the Combustion chamber of the internal combustion engine.
  • the energization of the electromagnet 60 is ended, so that the closing spring 62 the magnet armature 58 again moves in the direction of the valve piston 30 and the discharge throttle 54 is closed.
  • the build again initially existing pressure conditions in the control room 50 and in the pressure chamber 9 so that the valve needle 10 back again in the closed position, i.e. in contact with the valve seat 12 is and closes the injection openings 16.
  • a fuel injection valve in addition to the embodiment shown in the drawing of a fuel injection valve according to the invention it can also be provided more than two or only one drain hole Form 37 in the pressure piece 32. It can also be provided be, the recess 41 on the combustion chamber facing End face of the pressure piece 32 not in the form of an annular disk, but is designed in a different way than that in Figure 3 is shown. However, it must be ensured that the leak oil holes 37 with the outer surface of the Pressure piece 32 are connected. In addition, it can be provided be that the valve piston 30 is not at the bottom of a Blind hole 39 rests in the pressure piece 32, but that the Blind hole 39 is omitted and the valve piston 30 directly on the end of the pressure piece 32 facing away from the combustion chamber rests. In this case, the drain holes 37 to End of the pressure piece 32 facing away from the combustion chamber.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02006852A 2001-07-04 2002-03-26 Injecteur de combustible pour moteurs à combustion interne Withdrawn EP1273790A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001132450 DE10132450B4 (de) 2001-07-04 2001-07-04 Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10132450 2001-07-04

Publications (2)

Publication Number Publication Date
EP1273790A2 true EP1273790A2 (fr) 2003-01-08
EP1273790A3 EP1273790A3 (fr) 2004-08-18

Family

ID=7690605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02006852A Withdrawn EP1273790A3 (fr) 2001-07-04 2002-03-26 Injecteur de combustible pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP1273790A3 (fr)
JP (1) JP2003035233A (fr)
DE (1) DE10132450B4 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006091429A1 (fr) * 2005-02-22 2006-08-31 Siemens Vdo Automotive Corporation Injecteur a rampe commune avec dispositif actif de fermeture par pointeau
CN104265533A (zh) * 2014-07-31 2015-01-07 中国第一汽车股份有限公司无锡油泵油嘴研究所 一种新型共轨喷油器
CN104806399A (zh) * 2015-04-03 2015-07-29 西安交通大学 端面凸轮旋转伺服电机直驱的高压共轨喷油器控制阀

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6451883B2 (ja) * 2018-02-05 2019-01-16 株式会社デンソー 燃料噴射弁

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827267A1 (de) 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH494346A (de) * 1968-07-31 1970-07-31 Sulzer Ag Elektromagnetisch gesteuertes Brennstoffeinspritzventil einer Kolbenbrennkraftmaschine
DE8104272U1 (de) * 1981-02-17 1981-08-06 Robert Bosch Gmbh, 7000 Stuttgart Kraftsoffeinspritzduese
FR2528914A1 (fr) * 1982-06-18 1983-12-23 Semt Injecteur de combustible pour moteur a combustion interne
IT232490Y1 (it) * 1994-07-01 2000-01-10 Elasis Sistema Ricerca Fiat Dispositivo di registrazione della corsa dell'otturatore per un iniettore di combustibile
DE19946766C2 (de) * 1999-09-29 2001-07-26 Siemens Ag Injektor für eine Brennkraftmaschine mit Direkteinspritzung
DE10006111A1 (de) * 2000-02-11 2001-08-30 Bosch Gmbh Robert Kraftstoffeinspritzventil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827267A1 (de) 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006091429A1 (fr) * 2005-02-22 2006-08-31 Siemens Vdo Automotive Corporation Injecteur a rampe commune avec dispositif actif de fermeture par pointeau
CN104265533A (zh) * 2014-07-31 2015-01-07 中国第一汽车股份有限公司无锡油泵油嘴研究所 一种新型共轨喷油器
CN104806399A (zh) * 2015-04-03 2015-07-29 西安交通大学 端面凸轮旋转伺服电机直驱的高压共轨喷油器控制阀
CN104806399B (zh) * 2015-04-03 2017-06-06 西安交通大学 端面凸轮旋转伺服电机直驱的高压共轨喷油器控制阀

Also Published As

Publication number Publication date
DE10132450A1 (de) 2003-01-23
DE10132450B4 (de) 2010-02-11
EP1273790A3 (fr) 2004-08-18
JP2003035233A (ja) 2003-02-07

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